Combination-lock



A. F. BLECHSCHMIDT.

COMBINATION LOCK. APPLICATION FILED APR. 18'. 1918.

Patented July 26, 1921.

firmin ARTHUR F. BL'EGHSCHMIDT, OF DAYTON, KENTUCKY,

ASSIGNOR or ONE-HALF TO WALTER E. BEATY.

COMBINATION-LOCK.

Application filed April 18, 1918.

To all whom it may concern.

Be it known that I, ARTHUR F. BiinoH- SCHMIDT, a citizen of the UnitedStates, and a resident of Dayton, in the county of Campbell and State ofKentucky, have invented certain new and useful Improvements inCombination-Locks, of which the following is a full, clear, and exactdescription, reference being had to'the accompanying drawings, forming apart of this specification.

My invention relates to combination locks, and particularly to mechanismin such locks whereby the unwarranted withdrawal of the locking bolts isprevented.

In combination locks as at present constructed, it is the practice forthe bolt stop, whereby the locking bolts are prevented from withdrawalfrom looking position, to work directly into the notches in theturnblers on the dial stem. It is thus possible, by breaking or thedial, to remove the tunablers, and the locking bolts may thus bewithdrawn and the door unlocked. The chief object of my invention is toprovide means intermediate the tumblers and driver on the dial stein forholding the locking bolts in position, thus obviating the possibility ofunlocking the bolts by the removal of the dial, etc.

A further object of said invention is to provide means for automaticallylocking the intermediate mechanism bet-ween the locking boltsandtumhlers upon the removal of the tumblers, thus further insuring thesecurity of the lock.

Another object of my invention is to provide simple and convenient meanswhereby the combination of numbers for the unlocking of the lock may beeasily changed, and whereby a greater range of variation in the changesis obtained.

Other objects of said invention will appear from the followingdescription thereof.

In the drawings:

Figure 1 is a rear elevation of a combination lock constructed inaccordance with, my invention, the rear wall of the lock case be ingbroken away to disclose the mechanism;

Fig. 2 is a section of a portion of the lock;

Fig. 3 is a rear elevation of the bolt check in another position;

Fig. 4 is a section of a portion of the adjustable driver for theoperation of the tumblers;

Specification of Letters Patent.

of a threaded stein 17 Patented Jul 26', 1921. Serial No. 229,251. r i

Fig. 5 is a section of the adjustable ring constituting a part of saiddriver," 1

F g. 6 is a rear elevation of Fig. 5;

Figs. 7 and'8 aresectional -views of the parts of the adjustabletumblers; I

Fig. 9 is a rear elevation of one of the tumblers.

Fig. 10 is a sectional View of the combination mechanism. 7 i

he' numeral 1 indicates the lock case, which constitutes a housing forthe locking mechanism. Movably mounted in the case 1, bymeans of a boltand slots 2 and 3, is a locking bolt frame 4 having a vertical portion 5to which the locking bolts 6 are secured; the said bolts being arrangedto operate through openings in the end of the case and to engageopenings at theside of thedoor (not shown)jto lock the door in the usualmanner. The frame 4 is pivotally secured to an arm S7 carried by arotatableshaft 8,the shaft 8 being rotatable by any of the ordinarymeans at the front of the door for the operation of the locking bolts.Integrally. formed with the bolt frame is a bolt stop 9, which isarranged to engage in an opening 10 in a bolt check 11. The bolt check,11, which comprises a block of-iinetal, or other suitable material, ismounted on,or integrally formed with, arms 12, by means of whichit isslidably secured to the case 1, bolts 13 extendinglthrough .slots insaid arms. 1 1

Pivotally secured at 14 tothe case 1 is a tumbler arm 15. One-endof thearm 15 is pivotally secured to one of the the bolt check 11. tumbler armis bent ranged to engage in:

The other iendiof, the upwardly and is arthe notches in the driver andtumblers of the combination mechanism,

Rotatably mounted in the case 1 in the usual manner is the usualwdia lshaft, or stem 16, the frontend vofwhich has secured to it thegusualdial 17, foi governing the manipulation-of the tumblers. Secured to theinner end .of the dial stem 16 by means and flat key 18 is a driver disk19, the face of which is provided with an indicating pointiQO. Arrangedto be secured to the disk 19 in any suitable adjustment therewitlniisa'ring 21, the disk and'ring being both rabbeted to form the jointtherebetween, as shown in Figs. Land 5. The contacting vertical faces ofthe J arms 12 01 scales respectively,

the disk 19 and ring .of the bolt'check, "after described.

rabbets are toothed to provide rigid engagement between the parts in thedesiredadjustment. The face of the ring is provide with an annularscale, as shown in Fig. 6, and adjustments between the disk and ring areeffected by use of the said scale and the indicating point on the disk.The outer edge of'the" ring 21 is provided with a single notch 22, intowhich the end of the tumbler arm 15 is adapted to enter when said noteis properly positioned. Loosely mounted on the stem'16 is any suitablenumber of tumblers, each comprising a disk 23 and ring 2 1 constructedto be secured together ,bymeans of screws and a toothed rabbeted jointidentical with that between the disk 19' and ring 21. The disk 23 andrings 24: are also provided with indicating points and annular 21. Thetumblers are operated by means of the studs 25 in the usual manner. Eachof the tumblers is pro-V vided -witha notch 26 into which the tumblerarm 15 is adapted to enter when the notches are properly positioned.

'Movably mounted in the case 1 in front of the bolt check 11, 1s a pin27 a spring 28 resting in a recess in the case and mounted on the shankof said pin, places the pin in tension against the front ofthe boltcheck, as shown in Fig. 2. A the removal of the pin from the case wall.

The pin '27 is so positioned, relative team bolt check, fthat,when saidcheck IS in its lowermost position,it will clear the pinan permit thespring to forceit outwardly-over the bolt check, thus preventing. theralsing for the purpose herem- Theo eration ofthe lock is as follows: Inhave shown-the parts in unlocked position; in this position, the boltsare with- V usual manner until now, as freque drawn from bolt stop 9being in the/recess 8 is rotated so as 15; the weight of to drop whenthus may then be withdrawn, the -stop 9 entering the keepers (notshown), the 10 of the bolt check 11, its entrancetherein being ermit tedby the lowering of said check to t e posi tion shown because of theentrance of the end of the tumbler arm into the notches of the driverand tumblers. To look, the shaft ward into their keepers; spun, rockingthebolt check 11so that thelower portion thereof is opposite the boltstop 9. 0 unlock, the combination is; operated in the all of the notchesare in the end of'the tumbler arm the check 11 will cause it permitted,and the bolts the .dial is then alinement over the recess ntly happensin the breaking of safes, that the "dial is broken off and the driverand tumblers removec The tumbler arm 151s thus released, and the boltcheck 10 in the bolt check. Suppose h position, the check 11 which isautomaticall identical with those on head 28 prevents to throw the bolts6 forthetumbler arm andraismg consequently permitted to fall by its ownweight; there being no obstacle now in the way of the arm 15, as isordinarily presented by the base of the notches in the tumblers, thecheck 11 falls until the upper portion thereof, above the recess 10, isopposite the bolt stop 9; the bolts are thus as effectually looked aswhensecured by the lower portion of said check. Furthermore, when inthis clears the pin 27, forced outwardly over the check, thus preventingits beingraised until the pin hasbeen withdrawn.

As will be seen, the provlsion of the inter-. mediate bolt check, thuseffectually secures the lock against unwarranted tampering, as

the removal of the dial and tumblers only serves to secure the lockingbolts even more securely in locked position.

Aswill be seen, also, the making of the driver of two parts relativelyadjustable by means of the notched rabbeted joint together with thesimilar construction of the tumblers, gives a wide range of variationsin the adjustments of the combination as well as great facility in themaking of changes, since it is only necessary to remove the securingscrews in the driver or one or more of the tumblers, as may be desired,rotate the ring or rings on the parts together.

It will be understoodthat various modifications of the details ofconstruction above set forth may be made without departing from theprinciples of the invention, and I do not therefore limit myself to saiddetails, but deem myinvention to be, co-extensive with a fair andliberal. constructionof the appended claims. I

Having thus described my invention, what I cl aim as new and desire tosecure by Letters Patent, is:-

1. Inalock, the combination with looking bolts and tumblers, a bolt stopin connection with said bolts, a bolt ed intermediate said tumblers andsaid'bolt stop, said bolt check having an opening adapted to receivesaid bolt stop to permit the operation of said bolts, a tumbier'armpivotally mounted adjacent said bolt check and arranged to maintain adesired relation between said tumblers and said bolt check,

the disks andresecure check slidably mountmeanswhereby upon the removalof said 7 2. In a lock, the combinationwithlocking bolts and tumblers, abolt stop in connection with said bolts, a bolt check'slidably mountedintermediate said tumblers and said bolt stop, said bolt check havinganopening adapted to receive said bolt stop to permit the operation ofsaid bolts, a tunibler arm pivotally mounted adjacent said bolt checkand arranged to maintain a desired relation between said tumblers andsaid bolt cheek, means whereby upon the removal of said tumblers, whenthe bolts are in locking position, said bolt check is movedgravitationally, means whereby when so positioned it is adapted tosecure the bolts in such position, and a spring pressed pin arranged toengage over said bolt check when so positioned gravitationally toprevent raising the bolt check.

ARTHUR F. BLECHSCHMIDT.

